Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.5604d&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #56.04; Bulletin of the American Astronomical Society, Vol. 30, p.903
Astronomy and Astrophysics
Astronomy
Scientific paper
ORFEUS spectra of two hybrid stars alpha Aqr (G2 Ib, HD 209750) and alpha TrA (K2 II, HD 150798), and beta Dra (G2 Ib-IIa, HD 159181) cover the far ultraviolet region lambda lambda 912--1218 with a moderate resolution of ~ 3000. Blue--shifted O VI (lambda 1032) and C III (lambda 977) emission relative to Si III (lambda 1206) is detected in the two hybrid stars, and the markedly narrow resonance line profiles of C III and Si III in the two hybrid objects as compared to the coronal star beta Dra also suggest wind absorption. The observed Doppler shifts could be caused by a warm wind of at least 3x 10(5) K in the hybrid stars with outflows ~ 100--200 km\ s(-1) . An asymmetric profile of C III in beta Dra might also result from wind absorption, although the acceleration would have to begin at higher temperatures (T ~ 7000 K) in this coronal star as compared to the hybrids. Electron densities determined from C III multiplets in beta Dra and alpha TrA indicate values between 8.3--8.6 dex (cm(-3) ), giving a pressure of ~ 2 x 10(13) cm(-3) K at T ~ 7x 10(4) K. Wind absorption and interstellar extinction must be considered when applying emission line diagnostics in this wavelength region. These observations make the connection between hot and cool winds across the color-magnitude diagram, by demonstrating that intermediate warm winds exist among luminous stars.
Brickhouse Nancy S.
Dupree Andrea K.
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